In A there is no accidental before the 2nd crotchet of the middle voice. It is certainly an oversight – d2 was already at the beginning of the 2nd half of the previous bar, suggesting a modulation to E
major (the suggestion is even clearer in an analogous phrase in bars 275-276). The naturals are explicitly present in the four remaining similar places (bars 40, 48, 136 and 284). The sign was added already in GE1 (→FE→EE, →GE2), perhaps as a result of Chopin's intervention.
Compare the passage in the sources»
category imprint: Interpretations within context; Differences between sources
issues: Omission of current key accidentals, Errors of A, Authentic corrections of GE, Last key signature sign
notation: Pitch